Noun sleepy sickness has 1 sense
  1. sleeping sickness, sleepy sickness, epidemic encephalitis, lethargic encephalitis, encephalitis lethargica - an encephalitis that was epidemic between 1915 and 1926; symptoms include paralysis of the extrinsic eye muscle and extreme muscular weakness
    --1 is a kind of encephalitis, cephalitis, phrenitis
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